With over half of people currently in the Portland metro area having been born elsewhere, it would be hard to sort out whether cavities were the result of fluor

With over half of people currently in the Portland metro area having been born elsewhere, it would be hard to sort out whether cavities were the result of fluoride deficiency or some sort of selection bias in who chooses to live there. I never noticed a lot of fillings when I lived in Portland, but then I wasn't looking inside people's mouths.